W3C home > Mailing lists > Public > public-web-perf@w3.org > July 2011

Open Source Cross-Browser setImmediate in JavaScript

From: Donavon West <dwest@book.com>
Date: Sat, 2 Jul 2011 00:43:37 -0400
Message-ID: <237DC897563709478B3DF5D1C05034341438C54E@BNYVEXCH01.bnweb.user.bn>
To: <public-web-perf@w3.org>
I wrote Jason Weber and he turned me on to this group. Our desktop
Mac/PC applications use Webkit to create a custom "harness" for our NOOK
Study higher education ereader (http://nookstudy.com). It looks and
feels like a native desktop app, but uses web based technologies under
the hood. As such, we have thousands of lines of rather intense
JavaScript/HTML5/CSS3 code. As a developer, I really appreciate a faster
setTimeout(0) alternative and advocate for getting setImmediate into
future browsers.

I've written a cross-browser JavaScript implementation of setImmediate
along with a QUnit test suite (which could be used to test browser
implementations as well). It is open source and you can get it at
https://github.com/NobleJS/setImmediate (if you build on the tests,
please update GitHub).

My thoughts on the setImmediate API:

* personally I think that making it semantically identical to the
setTimeout API was overkill. A simple node.js process.nextTick would
suffice. I don't think anyone will ever call setImmediate and then clear
it. However,  for the sake of completeness it doesn't hurt to leave it
in (you can simply ignore the returned handle).
* please remove the case for a string eval'ed handler argument. Stop the
madness! Stop it now!

Donavon West
Software Development Manager
Barnes and Noble.com

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Received on Monday, 4 July 2011 12:21:00 UTC

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